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An optical-feedback transimpedance receiver for high sensitivity and wide dynamic range at low bit rates

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4 Author(s)
B. L. Kasper ; AT&T Bell Labs., Holmdel, NJ, USA ; A. R. McCormick ; C. A. Burrus ; J. R. Talman

A novel transimpedance optical receiver using optically coupled feedback rather than a conventional feedback resistor is described. The optically coupled feedback has a number of advantages, including: (1) elimination of feedback-resistor Johnson noise for higher sensitivity; (2) elimination of feedback capacitance for higher bandwidth; and (3) the capability of large feedback current with low output voltage for wide dynamic range. A theoretical analysis is presented, along with experimental results for a long-wavelength optical-feedback receiver at a bit rate of 1.5 Mb/s. The experimental receiver uses InGaAs p-i-n photodiodes and a silicon JFET preamplifier and obtains a maximum sensitivity of -63.8 dBm for an error rate of 1×10-7. When the receiver is optimized for high level signals, an optical dynamic range of 40 dB is attained with no preamplifier automatic gain control (AGC). The results of a transmission experiment over a length of 303 km of single-mode optical fiber at a wavelength of 1.55 μm are presented

Published in:

Journal of Lightwave Technology  (Volume:6 ,  Issue: 2 )